MAGNETIC EXCITATIONS IN PRASEODYMIUM ALLOYS

Abstract

We have studied the effect of alloying on the magnetic excitations in Pr with the PRISMA spectrometer at ISIS. The dispersion of the excitations in single crystals of Pr0.9Tm0.1 and Pr0.9Ce0.1 along the a*- and c*-directions has been compared with that in pure Pr. We find that alloying Pr with Tm changes the excitation spectrum very significantly, due to strong interactions with the Tm impurity mode, whereas alloying with Ce produces more subtle changes.